The technology and commercial status of powder-injection molding

JOM - The process of powder-injection molding (PIM) is a viable and competitive commercial technique that is being used to process complex-shaped parts of various materials in moderate to high...     

The influence of the substrate temperature on the preparation of thin film In2Te3

An optimum substrate temperature T_o of 453 K was found for the preparation of thin film In₂Te₃ by electron beam evaporation. Films prepared at this temperature are stoichiometric and exhibit a maximum hole mobility of 48 cm² V^-1s^-1 and a maximum hole concentration of 4.2 × 10¹⁸ cm^-3. These observations can be explained on the basis of the Vincett-Barlow-Roberts theory which predicts a value for T_o/T_b, where T_b is the boiling point, of 0.3. The electrical activation energies of the films were also determined and are discussed in terms of the possible defects present.     

An evaluation of vanadium oxycarbide as ladle addition to molten steels

The present paper deals with a process involving carbothermic reduction of vanadium trioxide to produce vanadium oxycarbide. The vanadium, oxygen and carbon constituents of the oxide-carbon reaction product of the present work satisfy the empirical formula VO(0.67-0.44)C(0.20-0.70) ⋅ The paper also presents results of additions of the various grades of vanadium oxycarbide to steel melts. Results of additions have been compared with those obtained with vanadium carbide and ferro-vanadium additions. Such studies have pointed towards the suitability of VO(_0.52-0.46)C(_0.23-0.37) for introducing negligible amounts of additional carbon into steel melts. An attempt has also been made on the electroextraction of vanadium using vanadium oxycarbide as soluble anode.     

Growth of AlN Films and Its Process Development for the Fabrication of Acoustic Devices and Micromachined Structures

AlN films were grown on silicon substrates by RF reactive magnetron sputtering. At high sputtering powers, (002) preferred orientation as well as Al-N absorption band becomes prominent. The surface roughness and grain size of sputtered films were found to increase with RF power. Surface acoustic wave (SAW) device has been made on the grown (002) oriented piezoelectric AlN film with interdigital transducer (IDT) electrodes spacing corresponding to a wavelength of 60 μm. The centre frequency of the SAW filter was found to be 84.304 MHz, which gives a phase velocity of 5058 m/s with an electromechanical coupling coefficient (K ²) of 0.34%. Low etch rate of AlN films were observed in doped TMAH solution. Three-dimensional suspended Cr/AlN/Cr/SiO₂ microstructures were also fabricated by wet chemical etching.     

In vitro biological and tribological properties of transparent magnesium aluminate (Spinel) and aluminum oxynitride (ALON<Superscript>®</Superscript>)

The purpose of this first generation investigation is to evaluate the in vitro cytotoxicity, cell-materials interactions and tribological performance of Spinel and ALON^® transparent ceramics for potential wear resistant load bearing implant applications. Besides their non-toxicity, the high surface energy of these ceramics significantly enhanced in vitro cell-materials interactions compared to bioinert commercially pure Ti as control. These transparent ceramics with high hardness in the range of 1334 and 1543 HV showed in vitro wear rate of the order of 10^?6 mm³ Nm^?1 against Al₂O₃ ball at a normal load of 20 N.